The Pumas scrapped to a narrow defeat against England at Twickenham last weekend and have called on the same fearsome front-row for their date with Warren Gatland's men.

Gatland has talked down the influence of the Pumas' scrummaging, but the trio of Rodrigo Rondero, Mario Ledesma and Martin Scelzo is set to cause a number of problems.

The superb Juan Martin Fernandez Lobbe retains the captaincy and starts at No.8 while Santiago Fernandez will continue his development as a fly-half in one of world rugby's most unforgiving atmospheres.

"Before coming on tour, we decided to play some players who perhaps did not have too much experience of international rugby," said Phelan. "We are not changing players because of performance. It is about what we think is best for this game against Wales.

"We think Wales will be very tough opponents - they are an excellent team that plays a very dynamic game. We saw them play New Zealand and Samoa recently, and also in the Six Nations this year. They are a good team that has played together a lot."